The invention provides an automatic line uploading system of sliding rails. The automatic line uploading system of the sliding rails is provided with a lifting and grabbing mechanism. The lifting andgrabbing mechanism comprises a rack arranged at the upper end, a lifting oil cylinder is arranged at the lower end of the rack, the piston rod end of the lifting oil cylinder is connected with a lifting rod, the lower end of the lifting rod is connected with a grabber mechanism, and the grabber mechanism is used for grabbing the sliding rails. First induction switch sets are mounted on tools and vertically arranged along the tools separately, a wire body tool end falling in-place induction plate is arranged on the lifting rod and inducts the corresponding sliding rail tools, when correspondinginduction switches induct the wire body tool end falling in-place induction plate, information is sent to a control center, and the control center controls the lifting rod to stop moving. As the automatic grabbing mechanism is arranged and the induction switches are arranged on the corresponding tools, the sliding rails are automatically unloaded on a line, and intelligent line loading is achieved.